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So after all I will give my sermon to your questions, uncertainties to.

I declare the boat as a seagoing/coastal cruiser.

Direct to your question weigth. I would build the boat with a weight of 1400 kg. First; because of my experience I know how to built light. Most builders ad unnecessary weight and when it is smearing the rest of the Epoxy in the pot somewhere. Example is my PELICAN. I give an empty weigth of 2000 kg The boat was on the scale of the kran exaxt 2000 kg. I give always the load waterline, for the KD 860 with 2800kg. Which means you can add another 1400kg. This is without rigging, deck gear etc.

Distance waterline bridge deck as shown 600 and 700mm from the cockpit. The bridge deck starts far aft to prevent to get water (not spray) over the deck. The anti vortex panels are so strong that almost nothing can break them. See picture on the Pelican album. We where taking the boat out the ice because of shifting wind direct. You can see in the ice the form from the underwatership with antivortex panels. We where sailing to windward with these as any good monmaran ( many persons withnessd this) We sailed as high on the wind as a "Spectra" from Shuttleword with big daggerboards. But, here comes the point, the work not as effective as board in very low windspeeds, and the chines of the hulls have to be as sharp as cou can make them. After we added the glass fiber to the hulls (radius chine 5mm, otherwise you can not get the glass fiber good around the chine) we added Epoxy with a lot of fused silica and made "sharp coners " again. All new aircrafts use the anti vortex panels now again (winglets is the same). I designed the whole boat for good windward performance as you mentioned without a deckhouse. Smaller catamarans crossed the oceans and sailed around the world. Including a Wharram 6,5m and a Heavenly Twin. The couple on the Heaven Twin had the bad luck to be in a storm in the Aguela stream. Nothing whorser as that. The bridgeck distance from the boat was by the way full loaden 300mm. Not cabable to look forward: you gave already one solution with a dome. Besides when I seat on the table I face towards the cockpit, and there we have enough windows/doors made from polycarbonate. Rigging, you are a great advocate of junk rigs (I belief you are the person who was looking for a junkrig solution for a Searunner, perhaps I am amiss). I like junkrigs to. But as from others mentioned, there windward performance is so la.la as we say in France. Besides the are very complicated (see the latest from Pete) with a lot of ropes everywhere. Only for this reason, the airstream will be disturped. Before the wind til 45 degree the are great. Now comes the point, the KD 860 is not slow so the apparent wind will move forward and you sail almost alwise on the wind. The weak point of the junk rig. Pete reached with the ORYX 14 knots, but for passages he slowed her down to 7 knots. Of course, then it works.See by the way the picture from his new rig. In the photo series is a photo from a friends junk with a semi wing sail he made for 50.000 pesetas. This sails here working great. This was an phantastic solution. This was around 1969. He could set the sails by hand, the floated more or less up. His halyard winch was green, because he never needed the thing. A tip no big watertanks, use a watermaker. We had an electric SURVIVOR. 12V, 5 Amps 10 liter water. We had a windgenerator and two very good solar panels. Was good for all the electrics, navvy lights, waterpomp etc. Engine, use a longtail drive with a penger in the mast beam with a Lewis surface piersing prop (the have props for low speed by the way) The produce now under an other name, because my friend Lewis is deat for some years, but you find them in the Internet. By the way you find here also a solution for looking forwards. See album 860Fi.?

I was now writing how it was coming in my mind. I know there are many English mistakes in, but I hope you get my gist and I am not in the mood to correct, sorry about that. At last, I do now somethin I never did before, here a rendering from a new design, a German customer called it a "Bohrinsel". Be assured the KD 860 will sail better as this thing.

Cheers

Bernd